Adds a minimal na-winit-glutin example

This example shows how to draw a triangle with GL[ES via the Glutin
crate (the app works on desktop and Android) and on Android it
demonstrates how to re-create the applications surface state when
it is paused and resumed.

The Renderer code and some utilities are from the upstream Glutin example.

Author: rib

na-winit-glutin/.gitignore

@@ -0,0 +1,21 @@
+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties
+*.so
+
+
+# Added by cargo
+
+/target